单选题A variable displacement system of hydraulic drives consists of （）.Aa variable displacement axial piston pumpBa constant displacement axial piston pumpCa reciprocating piston pumpDa centrifugal pump
单选题
A variable displacement system of hydraulic drives consists of （）.
A
a variable displacement axial piston pump
B
a constant displacement axial piston pump
C
a reciprocating piston pump
D
a centrifugal pump
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